Plaid Cymru, which sees itself as a left-wing party aiming to increase economic prosperity and social justice in Wales with independence as a long-term aim, will be hoping to add to its three MPs in Westminster.

Potted history:

The Party of Wales was established in 1925, but it had to wait until 1966 for its first electoral breakthrough, when party president Gwynfor Evans won Carmarthen in a by-election.

Image caption
Gwynfor Evans, who became Plaid Cymru's first MP in 1966

But Plaid Cymru struggled to build substantially on that success and has never won more than four seats at Westminster.

Other key players are Adam Price, a former MP and sitting AM who is co-ordinating the party's general election campaign.

Meanwhile, Ynys Mon AM Rhun ap Iorwerth is the party's director of communications. Both he and Mr Price have been tipped as future leaders of Plaid.

Hywel Williams, Plaid Cymru candidate in Arfon, is the party's leader in Westminster. Gareth Clubb is the party's chief executive.

Leader's philosophy in a quote:

"If the dark clouds of Tory rule lurk on the horizon, then Plaid Cymru is the ray of hope."

What the critics say:

"We want to ensure that Britain is a more secure and united nation - that means acting against the extremists who want to divide us but it also means standing up to the separatists who want to break up this precious union of nations," Theresa May, prime minister.

What do they hope to achieve?

Plaid will be hoping to hang on to their existing three seats, and is focused on a further six where the party thinks it can perform well.

The party is hoping to take the Labour-held seats of Ynys Mon, Rhondda, Caerphilly, Blaenau Gwent and Llanelli - as well as the Liberal Democrat-held seat of Ceredigion.

Wood wants to send the "largest number of Plaid MPs possible" to Westminster, and if she falls short, she says she's will not resign.

"I've got a long-term project. It's building quite well and I want to see it through," she says.

Strong suit?

Leanne Wood argues that only her party can protect Wales against what could be a dominant Conservative government, citing what she says is falling support for Labour. In the 2017 local elections Plaid gained 33 seats, while Labour lost 107, although it remained the biggest party in Wales.

Where do they stand on Brexit?

Plaid Cymru, which campaigned to stay in the EU, says it accepts that the people of Wales voted to leave, but says single market membership should be preserved to protect Welsh jobs.

As in England, the majority (52.5%) of voters in Wales voted to leave the European Union.

In January, Wood and the Welsh First Minister Carwyn Jones jointly published a white paper setting out Wales' plans for Brexit.

At its heart were proposals for "continued participation in the single market" as well as a "balanced approach to immigration linking migration to jobs".

Other demands included "a fundamentally different constitutional relationship between the devolved governments and the UK government" as well as "proper considerations of a transitional agreement."

Five key policies:

Protect Wales's economy, identity, and the Assembly from a Conservative power grab

Ensure every penny that is lost from Europe as a result of Brexit is replaced by Westminster